Animal viruses without envelopes enter the host cell via fusion with the cell membrane.
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Q21: BSE is caused by an infections protein
Q22: What type of molecule are viroids composed
Q23: Viral genomes are difficult to sequence.
Q24: Creutzfeldt-Jakob disease (CJD) is a fatal prion
Q25: What adaptation helped the strain of influenza
Q27: All enveloped animal viruses have protein spikes.
Q28: Viroids consist of only RNA molecules.
Q29: Viruses are too small to carry any
Q30: Influenza is caused by a DNA virus.
Q31: Some viruses can cause cancer.
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